The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1997
Filed:
Feb. 12, 1996
Ulrich Kohn, Backnang, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The optical amplifier device for an optical transmission system with bidirectional wavelength multiplex to a light transmission wave guide includes a first optical amplifier (OV1) for amplifying signals of a first wavelength (.lambda..sub.1) in a first direction; a second optical amplifier (OV2) for amplifying signals of a second wavelength (.lambda..sub.2) in a second direction; a first wavelength selective coupler (WDM1) connecting the input of the first optical amplifier (OV1) and the output of the second optical amplifier (OV2) with a light transmission wave guide (U) and a second wavelength selective coupler (WDM2) connecting the input of the second optical amplifier (OV2) and the output of the first optical amplifier (OV1) with the light transmission wave guide (U). Because of reflections noise amplification due to resonance would be considerable but according to the invention the noise resonances are prevented since the wavelength selective couplers (WDM1, WDM2) have a signal attenuation of 3 dB at different wavelengths.